I run Comodo and avast free too. I will give you advice on how to make both of them run well.
1. Uninstall avast and Comodo.
2. Downlaod a avast and comodo firewall (make sure is comodo firewall and not internet security)
3. Install avast.
4. Update and configure it to your liking.
5. Install Comodo.
6. Right click and put Defense + and Firewall into training mode.
7. Restart.
8. Now launch everything that you use and everyrthing that require a internet connection.
9. Put all avast files into Trusted under Defense + (avast files can be found in Program files and program data in win 7)
10. Put aswupd.exe (If I am not mistaken that is the name of avast update)file into trusted into firewall.
11. Put Defense +and Firewall back into safe mode after you are done.
It should solve your problem. I never have any issue with that set up. Online Armor is good. Persoanl experience. But I stop using it as it sometimes didn't learn anything even when I put it into learning mode. From what I read at Wilders Security, Matousec demamnd more money for the test and Emisoft refuse to give. Hence Matousec remove Online Armor. Online Armor is quite a good firewall.
See here for more info :
http://www.wilderssecurity.com/showthread.php?t=281529Folks at Wilders take security very seriously.